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Preparation and properties of ZSM-5 zeolite membrane obtained by low-temperature chemical vapor deposition

机译：低温化学气相沉积获得ZSM-5沸石膜的制备及性能

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A zeolite membrane was obtained by in situ crystallization of silicalite-1 from a layer of silica species prepared by the novel method of low-temperature chemical vapor deposition (LTCVD) on a porous cordierite support. The XRD and SEM analyses showed a three-layer membrane: a 3-5 μm-thick compact layer, a 45 μm-thick zeolite-in-pore layer and the support. The pure gas permeation data indicate that the synthesized zeolite layer is dense and pinhole-free. In water-alcohol mixture pervaporation, the membrane exhibited a behavior of hydrophilic materials, with a high selectivity to water and a fair flux. This behavior can be explained by the presence of Al in the framework due to Al migration from the support. The membrane flux and selectivity decreased fairly slowly with time in the transient regime of water-ethanol pervaporation with the dry membrane, suggesting slow sorption equilibria of water and ethanol with the dry zeolite.
机译：通过在多孔堇青石载体上从由低温化学气相沉积（LTCVD）的新方法中制备的二氧化硅物种层，获得沸石膜。 XRD和SEM分析显示了三层膜：3-5μm厚的致密层，45μm厚的沸石 - 内孔层和载体。纯气体渗透数据表明合成的沸石层是致密的，无针孔。在水醇混合物渗透蒸发中，膜表现出亲水材料的行为，对水的选择性高和通量。由于Al迁移来自支持，可以通过框架中的框架中的存在来解释这种行为。膜通量和选择性随着干膜的水 - 乙醇渗透渗透渗流的瞬态状态下降，表明水和乙醇与干沸石的缓慢吸附平衡。

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